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   1  <?php declare(strict_types=1);
   2  
   3  /**
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2022 The s9e authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\TemplateNormalizations;
   9  
  10  use DOMElement;
  11  
  12  /**
  13  * Add a value to a list of space-separated value
  14  */
  15  class AddAttributeValueToElements extends AbstractNormalization
  16  {
  17      /**
  18      * @var string Name of the attribute to modify
  19      */
  20      protected $attrName;
  21  
  22      /**
  23      * @var string Value to be added to the attribute
  24      */
  25      protected $value;
  26  
  27      /**
  28      * @param string $query    XPath query used to locate elements
  29      * @param string $attrName Name of the attribute to modify
  30      * @param string $value    Value to be added to the attribute
  31      */
  32  	public function __construct(string $query, string $attrName, string $value)
  33      {
  34          $this->attrName = $attrName;
  35          $this->queries  = [$query];
  36          $this->value    = $value;
  37      }
  38  
  39      /**
  40      * Explode a string of space-separated values into an array
  41      *
  42      * @param  string   $attrValue Attribute's value
  43      * @return string[]
  44      */
  45  	protected function getValues(string $attrValue): array
  46      {
  47          return preg_match_all('(\\S++)', $attrValue, $m) ? $m[0] : [];
  48      }
  49  
  50      /**
  51      * {@inheritdoc}
  52      */
  53  	protected function normalizeElement(DOMElement $element): void
  54      {
  55          $currentValues = $this->getValues($element->getAttribute($this->attrName));
  56          if (!in_array($this->value, $currentValues, true))
  57          {
  58              $currentValues[] = $this->value;
  59  
  60              $element->setAttribute($this->attrName, implode(' ', $currentValues));
  61          }
  62      }
  63  }